Overview
EMC-Epoxy Molding Compound is a critical material in electronics manufacturing, primarily used for encapsulating semiconductor devices. Composed of epoxy resins, hardeners, silica fillers, and additives, it provides robust protection against moisture, thermal stress, and mechanical damage. Developed in the 1970s, EMC replaced ceramic and metal packages due to its cost-effectiveness and adaptability to mass production. Modern formulations meet stringent industry standards for reliability in automotive, aerospace, and consumer electronics applications.
Physical and Chemical Properties
EMC exhibits low coefficient of thermal expansion (CTE, 8–20 ppm/°C), closely matching silicon chips to prevent delamination. Its thermal conductivity ranges from 0.6–2.5 W/mK, depending on filler composition. Flame retardancy typically meets UL94 V-0 standards. The material transitions from a viscous liquid to a rigid solid during curing (exothermic reaction). Post-cure, it achieves a glass transition temperature (Tg) of 120–200°C and a flexural strength of 100–150 MPa. Humidity resistance is ensured by <0.1% water absorption after 24-hour immersion.
Main Applications
Over 90% of plastic-encapsulated microcircuits use EMC, including QFN, BGA, and SOP packages. It’s indispensable for MEMS sensors, IGBT modules, and high-brightness LED encapsulation. Automotive-grade EMC withstands -55°C to 175°C cycling. Emerging applications include 5G RF components and power electronics, where low dielectric loss (Dk 3.5–4.5 at 1 GHz) is critical. Specialty grades with low alpha-particle emission (<0.001 counts/cm²/hr) are used in DRAM packaging.
Safety and Storage
Uncured EMC may release trace phenol or formaldehyde during processing. Facilities should have local exhaust ventilation and HEPA filtration. Store in original moisture-proof bags with desiccant; shelf life is typically 6–12 months at <25°C/60% RH. Spent material should be disposed as non-hazardous waste after complete curing. Thermal degradation above 300°C may release toxic fumes, requiring incineration with scrubbers.
B2B Procurement Guide
Key specifications to evaluate include spiral flow length (80–120 cm at 175°C), warpage (<3 mils for thin packages), and wire sweep resistance. For high-frequency applications, request dielectric property data across the operating frequency range. Major global suppliers include Sumitomo Bakelite, Hitachi Chemical, and Hysol. MOQ for standard grades is usually 500 kg, with lead times of 4–8 weeks. Sample quantities (1–5 kg) are often available for material testing.
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